Spring ISD experienced an accidental insider data disclosure in which an employee transmitted employee PII including Social Security numbers to unintended recipients via misdirected email; this is not an external attack or software vulnerability but a data handling control failure (CWE-200, CWE-359). The incident carries direct regulatory exposure under Texas Business and Commerce Code Chapter 521 and potentially federal requirements depending on data scope. Immediate actions include confirming recipient notification and deletion, auditing DLP policy enforcement gaps that permitted the outbound transmission, and evaluating state breach notification obligations.